I understand that with Turbotax, you can only e-file the current year taxes. I need to file taxes for 2016 to 2019 inclusive. Does anybody have information on how long it takes the IRS to process hard copy filings of back taxes? Also, should I separate each filing (e.g., 2016, 2017) by a period of time, for example, one week, or is this not necessary. Thanks you!
